package com.itheima.controller.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter("/*")
public class LoginFilter implements Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        request.setCharacterEncoding("utf-8");
        Object user = request.getSession().getAttribute("user");

        String uri = request.getRequestURI();
        if ("/login.html".equals(uri) || uri.endsWith(".css") || uri.endsWith(".js")){
            chain.doFilter(request, response);
            return;
        }

        String method = request.getParameter("method");
        if (uri.equals("/userServlet") && "findByUsernameAndPassword".equals(method)){
            chain.doFilter(request,response);
            return;
        }
        if (user == null){
            response.sendRedirect("login.html");
            return;
        }
        chain.doFilter(request, response);
    }

    public void init(FilterConfig config) throws ServletException {

    }

}
